<template>
  <div class="app-container">
    课程列表

    <!--查询表单-->
    <el-form :inline="true" class="demo-form-inline">
      <el-form-item>
        <el-input v-model="courseQuery.title" placeholder="课程名称" />
      </el-form-item>

      <el-form-item>
        <el-select
          v-model="courseQuery.status"
          clearable
          placeholder="课程状态"
        >
          <el-option :value="`Normal`" label="已发布" />
          <el-option :value="`Draft`" label="未发布" />
        </el-select>
      </el-form-item>

      <el-form-item>
        <el-date-picker
          v-model="courseQuery.date"
          type="datetime"
          placeholder="选择截止时间"
          value-format="yyyy-MM-dd HH:mm:ss"
          default-time="00:00:00"
        />
      </el-form-item>

      <el-button type="primary" icon="el-icon-search" @click="getListPageCondition()"
        >查询</el-button
      >
      <el-button type="default" @click="resetData()">清空</el-button>
    </el-form>

    <!-- 表格 -->
    <el-table
      :data="list"
      element-loading-text="数据加载中"
      border
      fit
      highlight-current-row
    >
      <el-table-column label="序号" width="70" align="center">
        <template slot-scope="scope">
          {{ (page - 1) * limit + scope.$index + 1 }}
        </template>
      </el-table-column>

      <el-table-column
        prop="title"
        label="课程名称"
        width="150"
        align="center"
      />

      <el-table-column label="课程状态" width="80">
        <template slot-scope="scope">
          {{ scope.row.status === "Normal" ? "已发布" : "未发布" }}
        </template>
      </el-table-column>

      <el-table-column
        prop="lessonNum"
        label="课时数"
        width="80"
        align="center"
      />

      <el-table-column
        prop="title"
        label="课程简介"
        width="400"
        align="left"
      />

      <el-table-column
        prop="gmtCreate"
        label="添加时间"
        width="160"
        align="center"
      />

      <el-table-column
        prop="viewCount"
        label="浏览数量"
        width="60"
        align="center"
      />

      <el-table-column label="操作" width="150" align="center">
        <template slot-scope="scope">
          <router-link :to="'/course/info/' + scope.row.id">
            <el-button type="text" size="mini" icon="el-icon-edit"
              >编辑课程基本信息</el-button
            >
          </router-link>
          <router-link :to="'/course/chapter/' + scope.row.id">
            <el-button type="text" size="mini" icon="el-icon-edit"
              >编辑课程大纲</el-button
            >
          </router-link>
          <el-button
            type="danger"
            size="mini"
            icon="el-icon-delete"
            @click="removeCourseById(scope.row.id)"
            >删除</el-button
          >
        </template>
      </el-table-column>
    </el-table>

    <!-- 分页 -->
    <!-- @current-change="fetchData"
        v-on: => @
         -->
    <el-pagination
      background
      :current-page="page"
      :page-size="limit"
      :total="total"
      style="padding: 30px 0; text-align: center"
      layout="total, prev, pager, next, jumper"
      @current-change="getListPageCondition"
    />

  </div>
</template>
<script>
//引入调用course.js文件
import course from "@/api/course/course";

/**
 * 核心代码位置
 */
export default {
  data() {
    //定义变量和初始值
    return {
      list: [], //查询之后接口返回集合
      page: 1, //当前页
      limit: 10, //每页数量
      total: 0, //总记录数
      courseQuery: {}, //条件封装对象
    };
  },
  created() {
    //页面渲染之前执行，一般调用methods中定义的方法
    //调用
    this.getListPageCondition();
  },
  methods: {
    //课程条件查询带分页
    getListPageCondition(page = 1){
      this.page = page
      course.pageCourseByCondition(this.page,this.limit,this.courseQuery)
        .then((res) => {
          // 总页数
          this.total = res.data.total
          //带查询条件返回的记录
          this.list = res.data.rows
        })
        .catch((error) => {
          console.log(error);
        })
    },
    //删除课程
    removeCourseById(courseId) {
      this.$confirm("此操作将永久删除该记录, 是否继续?", "提示", {
        confirmButtonText: "确定",
        cancelButtonText: "取消",
        type: "warning",
      }).then(() => {
        course.delteCourseById(courseId).then((res) => {
          //点击确定，调用删除方法
          this.$message({
            type: "success",
            message: "删除成功!",
          });
          //回到列表
          this.getListPageCondition();
        });
      });
    },
    //创建具体的方法，调用course.js中定义的方法
    //讲师列表的方法
    // getList() {
    //   course
    //     .getListCourse()
    //     .then((res) => {
    //       //成功
    //       this.list = res.data.courseList;
    //     })
    //     .catch((error) => {
    //       //失败
    //       console.log(error);
    //     });
    // },

    //清空选项的方法
    resetData() {
      //清空courseQuery
      this.courseQuery = {};
      //查询所有信息
      this.getListPageCondition();
    },
  },
};
</script>